Process of purifying turpentine.



To all whom it may concern:

dist

This is particular variety of p o a. STATES PATENT; oration.

' 'n annr 0'; errors, or oLEvELANmonio.

' rnocnss or rim-remo 'rrmrnm- Letters Patent.

- K iiEsti filed October 1?), 190?. Serial No.

Be it known that I HARRY 0. Genre, a citizen of the United States 'residin at Cleveland, Cu ahoga county, tate of bio, have invente certain new and useful Improvements-in Processes of Purifilng Turentine; and I do hereby declare t e ollowmg to be a full, clear, and exact descri tion of the same, such as will enable others s ed in the art, to which it appertains topractice and use the same.

fllhisinvention relates to processes of puritying turpentine; and. consists in a method of pa the commercial wood turpentines by treatment with alcohol to remove ill smelling impurities;- all as more fully hereinafter set forth and-as claimed:

The wood turpentines rarelyhave a clean, pure smell such as'characterizes the purer turpentines derived from gum tur ntine, an for this reason are not gener y liked in the trade. Pine wood contains a-large proportion of the turpentine bodies which occur in gum turpentine, and wood turpentines are therefore now largely pre: pared by the direct distillation of coniferous wood either by destructive distillation or by illation with steam, hot gases or the like.

In either form of distillation of wood how-- ever, many other volatile bodies are distilled over .with the turpentine and contaminate it, giving it-an unpleasant odor and causing it to work somewhat differently in many arts from thetur entine of gum turpentine. true of t e wood turpentine made by estructive distillation ofwood,-such tur entine containing a wide lg tic'products' of resin and wood. In.,t eturpentine' from steam disturpentine with more al tilled wood and gas distilled wood, these impurities aiielprobably largely terpenes and rosmoils, w e in the .turpe structive distillation there "are also ketones,

aldeh dos," phenols and-"many less well'defined. odies. a n

I havediscovered'that biagitatingwood :1 dissolvmthese foreign bodies for thevmos't part willleave the turpentine to dissolve in the alcohol layer Turpentine is not readily ,miscible with :the loweralcohols, particu? lafiyewhen the lattenare absolute,

ntine from deol than-it will amount of such aloe ols," the mass will sepa-' rateinto two layers; one of turpentine containing more or less alcohol but freed of odorous impurities and one of alcohol ca ing these impurities together with a litte hol'with turpentine isgreater than that of grain alcohol, and I therefore at present preer the former in carrying out my process.- But the immiscibiiity of either alco 01 and turpentine can be heightened to any degree desired by the use. of a littlehydrocarbon'; preferably one which is insoluble in alcohol, such as the hvdrecarbons' from petroleum and particularly Pennsylvania etroleum. Using commercial denatured spirit which already contains a little 'gasolcne, this gasolene will unite with the turpentine and make the alcohol much more insoluble or immiscible than would be pure grain alcohol of the same stre h.

When a drocsrbon is used for heiwhtezb in the immiscibility of turpentine and alcobod, it is preferably one which boils at a'temperature rather far removed from the boiling point of turpent'me (158 C.), so that it may afterwards be readily eliminated from the referably it is lower boiling so that it can be ing-the treat turpentine, but itmay be a very hi h boiling hydrocarbon, such as vase line or ubricatine' oil, if the turpentine itself is to be afterwards distilled. Ordinary lowboiling petroleum ether, gasolene, na htha; benzm and grades of hydrocar on may, be employed, such hydrocarbon being preferably redistiIte-d to free it of impurities tine.

very great extent with tu entine, and it may be employed directly without the use of us. Grain alcohol is more miscible.- owever, in either case sincethe alcohol -which dissolves'in the turpentine may be of the pure alcohdls is not greatly disadvanta sous.

- a turpentine and alcohol maybe agitated turpentine. The immiscibility of wood alco- 3 Ordinary wood spirit is not miscible to any ratentea'nu 4; "1908.;

upon shaking up wentinewith a sufficient urified turpentine by simple distillation.

distilled off to ether with alcohol in purify-.

- aving boiling points too near that of turpen,

hydrocarbon, thorrgh such use is advantaafterwards recovered, the limited miscibility l l I together in any suitable form of mixing apparatus and after agitation allowed to carbon, such as'gasolene, may be previously stand until gravital separation takes place;

. after which the turpentine and impure alcohol may-be separately drawn off. A hydrodissolved in the turpentine, or it may be added during or after the agitation- I prefer to add it after having. agitated'alcohol and turpentine together, as it then apparently makes a better separation of the impurities.

It is advantageous to add enough tolighten the turpentine-so that it will float on the alcohol. Under these conditions the separation between alcohol and turpentine becomes sharper, less alcohol dissolves in the turpentine and less turpentine in the alcohol, and l the impurities from the turpentine can betaken up in less alcohol. The turpentine se arated contains a little alcohol and any a dad hydrocarbon, and is now substantially free ofthe original foul odor. It may be sent through any ordinary fractionating apparatus to free it of alcohol and low-boihng hydrocarbon, if the latter were used, and form substantially pure, clean smelling, marketable turpentine. In purifying wood 7 turpentine, the/alcohol separated is usually distillation. The alcohol may. also be treat-- very foul-smelling; and particularly so in the case of wood turpentine made by destructive ed in any-ordinary t e of fraction'ating apparatus, such as a c l iimn still, to free it of the dissolved impuritiesand' adapt it for reuse. The im urit-ies from wood turpentine separated an recovered in this operation "are well adapted for denaturing spirit.

equallv useful.

In treatin turpentine with gasolene and wood alcoho very little of the latter dis solves in the .tu entine, and this small amount-"is rega in'e infractionating off the gasolene from the purified turpentine, coming over with the asolene as an immiscible distillate. The 'stillate may be returned for use in the (process without separating the gasolene an alcohol.

In suing denatured spirit containin gasolene, the gasolene leaves the spirit or the tu entine and is as efficient as specially ssolene as remains alcohol is of course Y No heating is necessary in agitating the alcohol and turpentine together though some heat may be used if desired, the heated and agitated mixture bein afterad ed gasolcne. Such dissolved in the reeovere wards allowed to cool before gravitay sep-' arating the alcohol and tu entine, their immiscibility being greater at ow temperatures.

Preferably the alcohol employed is fairly strong, say above 80 per cent.; and 95 per cent. is better.

In practical OPBIMI-IOITOf: the described l proce'ss, I may treat 100 gallons of com mer- 3 cial wood turpentine with commercial wood spirit of about 96 per cent., using 25 allons of such wood spirit. I can add 25 gal ons of commercial 'gasolene to the turpentine, or to the agitated mixture; allow the mixture to stand after agitation and separate. The turpentine I can then distil in a column'still Q or other fractionating apparatus to remove and regain the alcohol or gasolene, or both. ET he turpentine emerging from the still is 1 directly marketable, or it may be redistilled, i as in a current of steam, or otherwise treated, I where special grades are desired.

1 The distilled alcohol from the turpentine, 'a when gasolene has been used, will separate gusolene and the other most oi the alcohol. i'llu alcohol separated gravitally from the Lturpentinais also redistilled in any suitable fmctionating apparatus, regaining alcohol for reuse. The residue of high-boiling impurities coming from the fractionating apparatus may be utilized as solvents or as denaturing agents. The regained alcohol is directly ap licable for reuse.

When a- 'gh-boiling hydrocarbon such as vaseline or lubricating oil, is used for promoting immiscibility of alcohol and turpentine, it is best separated from the latter by distilling the turpentine with steam or hot gases.

What I claim is:

tine and an alcohol together, such alcoholbeing in sufiicient amount to form an immiscible layer gravitally separating the layers and purifying the turpentine.

2. The process of purifying wood turpentine which consists in agitating such turpentine and wood alcohol together, such alcohol being in sufficient amount to form an im layers and purifying the turpentine.

3. The process of purifying wood turpentine which com rises agitating such turpentine, an alcoho and an alcohol-immiscible hydrocarbon together, gravitally separating and purifying the turpentine.

4. The process of purifying wood turpentine which com rises agitatingsuch turpentine, wood alco l0]. and an alcohol-insoluble hydrocarbon together, gravitally separating and purifying the turpentine.

5. The process'of purifying wood turpentine which com rises agitating such turpentine and an a cohol together, adding an alcohohinsolnble hydrocarbon and continuing the agitation, gravitally separating and purifying the turpentine.

6. The process of purifying wood turpen into two layers; one containin most of the Y V 1. The process of purifying wood turpentine which consists in agitating such turpenmiscible layer gravitaily separating the I 'a1cohol-insolub1e hydrocar tine which comprises agitating such tni'pentine and wood alcohol tofther, adding an ing the agitation, gra vitaliy sepamting and 5 purifying the turpentine.

7. The process of pugifying wood turpeneine which com rises agitatmg such turpentine and wood a cohol together, adding gasoon and oontmu- In testimony whereof m the presence of two witnesses.

Witnesses: K. P. MQELBOY,

Am-" mn M. Houcm'ou.

HARRY 0. CHUTE,

I lene and continuing the agitation, grevita'llj separating and purifying"1 the turpentine.

1o afiix my signature, 7 

